Phase transition modelling

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rhub
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Joined: Thu Aug 11, 2022 9:27 am

Phase transition modelling

Post by rhub »

Hi all,

I am a quite new user of FreeCAD and I am trying to model phase transition using a temperature dependent specific heat as specified on the CalculiX website (https://www.feacluster.com/CalculiX/ccx ... de172.html) but cannot find a way to do so.

Does anyone know about such feature in FreeCAD?

Thanks
Romain

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chrisb
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Re: Phase transition modelling

Post by chrisb »

Hi and welcome to the forum!

I moved the post to the FEM section. It is probably sensible to update to 0.20 or 0.21 so that helping comments match your version of FreeCAD.
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NewJoker
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Re: Phase transition modelling

Post by NewJoker »

rhub wrote: Thu Aug 11, 2022 9:39 am Does anyone know about such feature in FreeCAD?
FreeCAD doesn't support temperature-dependent material properties so you will have to edit the input file manually.
Jee-Bee
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Re: Phase transition modelling

Post by Jee-Bee »

Isn't that a part of non linear materials? i kind of would expect that...
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NewJoker
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Re: Phase transition modelling

Post by NewJoker »

Jee-Bee wrote: Thu Aug 11, 2022 11:59 am Isn't that a part of non linear materials? i kind of would expect that...
No, FEM MaterialMechanicalNonlinear is just for plasticity and there's no equivalent for thermal properties.
rhub
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Re: Phase transition modelling

Post by rhub »

NewJoker wrote: Thu Aug 11, 2022 11:53 am FreeCAD doesn't support temperature-dependent material properties so you will have to edit the input file manually.
Thanks for your answer

So I should provide some sort of csv type file including temperature ans specific heat values which would replace the specific heat value inside the .inp file, is that right?
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NewJoker
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Re: Phase transition modelling

Post by NewJoker »

rhub wrote: Thu Aug 11, 2022 12:51 pm So I should provide some sort of csv type file including temperature ans specific heat values which would replace the specific heat value inside the .inp file, is that right?
It's not necessary. Just define it like this:

Code: Select all

*Specific heat
value1, temperature1
value2, temperature2
value3, temperature3
...
rhub
Posts: 3
Joined: Thu Aug 11, 2022 9:27 am

Re: Phase transition modelling

Post by rhub »

NewJoker wrote: Thu Aug 11, 2022 1:02 pm It's not necessary. Just define it like this:

Code: Select all

*Specific heat
value1, temperature1
value2, temperature2
value3, temperature3
...
Thank you, I just tried this out and it worked.
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